Automatic jack.



F. C. PREIFERT & F. SCHULZ.

AUTOMATICJACK.

APPLICATION FILED MAR. 28, 1917.

2 SHEETS-SHEET I.

, INVENTORS Fre dericidPreife r2, Fg rd ma nd cfcizulz,

Patented May 21,1918.

F. C. PRE IFE'RT & F. SCH ULZ.

AUTOMATICJACK. I APPLICATION man MAR. 23. 1917.

Patented May 21,1918.

2 SHEETS-SHEET 2.

4 INVENTORS fiede/zd, Cire ife r2? Fe r d inand c/ vi 2 aZ fW (a ATTORNEYS nnrrnn s ra rns ra rnnr orrrnn.

FREDERICK C. PREIFERT AND FERDINAND SCHULZ, OF BEAVER CROSSING, NEBRASKA.

AUTOMATIC JACK.

Patented May 21, 1918.

Application filed March 28, 1917. Serial No. 158,006.

To all whom, it may concern:

Be it known that we, FREDERICK C. PREI- rum. and FERDINAND SCHULZ, citizens of the UnitedStates, residing at Beaver Crossing, in the county ofSeward and State of Nebraska, have invented a new and Improved Automatic Jack, of which the following is a specification. v

This invention has reference to that class of appliances or mechanisms used in garages for raising auto vehicles and sustaining them in. position to relieve the tires from the weight of the car, and our said invention more particularly relates to improvements on that type of auto jack mechanism disclosed in ourv copending application filed January 2a, 1917 Serial No. 144,263.

In the construction of auto jack as disclosed in our copending application, means in the nature of automatically adjustable or drop legs are provided for sustaining the rear end of the jack at the elevated position,

when the vehicle is jacked up.

Our present invention primarily has .for its purpose to dispense with the drop legs and kindred devices commonly used in auto jacks for holding up the rear end of the jack and to provide a simple means for holding the jack frame at the elevated or jacked up" position.

With the above and other objects in view to be hereinafter explained, our invention is an improved auto jack that embodies the peculiar features of construction and co6perative arrangement of the parts to be first explained in detail, specifically pointed out in the appended claims and illustrated in the accompanying drawings, in which:

Figure 1 is a perspective view of our improved auto jack, the parts being in the normal position.

Fig. 2 is a diagrammatic side elevation of our improved automobile jack, the parts being shown at a normal position ready for being engaged by the auto car to be sustained thereon.

Fig. 3 is a similar view thereof, the parts being shown positioned as when the car is held thereon. 1 .5),

Figs. 4c and 5 are detail side views of a slightly modified arrangement of the illclined ways or blocks for the rear end of the jack and their cooperative connection with the rear roller bearing.

In carrying out our present invention, the jack frame consists of a pair of side sills l 1, preferably in the nature of I-beams that are joined at their opposite ends by cross members 2 2 and intermediate the said ends by a cross member 41, the latter and the end beams 22 being also shown as I-beams.

6 6.are stops or abutments on the upper side. of the side sills 11 at the front ends thereof and the said stops 6-6 are preferably angle members bolted to the said beams, as shown.

13 14 are roller bearings, one of which 13 supports the front end of the jack frame and the other 14L, the rear end of the said frame and at the said front ends, the side beams have tapered bearing blocks 2020 attached to their under-face, similar bearing blocks 2121 being secured on the underside of the side beams at their rear end, as is best shown in Fig. 1.

Blocks 23.23 are secured on the top of the side sills, at the rear ends thereof, that form the bearings for the rear axle of the motor car when it is jacked up, as is shown in Fig. 3.

As is clearly shown in Fig. 2, the blocks I 28, when the parts that constitute our improved jack are at their normal position, as shown, the said blocks 23 are low enough to permit the front axle of the car to pass thereover while the vehicle passes onto the jack frame, the latter having pendent stops 20 at the front end that serve to hold the frame from being pulled backward off the bearing rollers ;-and at this point it should be stated that the inclines of the front blocks 20 may be arranged to engage the front roller 13 slightly before the inclines on the back blocks 21 engage the rear roller 14, to thereby provide for a longer contact of the rear wheels with the floor after the front wheels are raised, it being also understood that the momentum of the machine moves the jack frame forwardly until it assumes the position shown in Fig. 3 which shows the back and front wheels, as elevated.

When the parts are, as shown in Fig. 2, and when the motor car passes over the jack frame, the front axle 3 engages the stops 6 at the front end of the sills 1 and the said frame is thereby caused to move along with the front and back rollers 1314, which latter, by reason of their engagement with the incline bearings of the blocks 20-21, elevate the jack frame with the motor car supported thereon,

Abutments 24, secured to the inner ends of the blocks 20 are provided to stop the roller 13 from further turning when the car is at the elevated position.

Instead of securing the tapered blocks '21-'21 to the under side of the sills 1-1,

as shown in Figs. 2 and 3, the same operative results are obtained by reversing the parts, 2'. a, the members 21 may be placed on the floor in front of the rear roller 14 and the latter thereby caused to travel up the inclines 21 as the frame is being pushed forwardly under a motorengine power.

From the foregoing description taken in connection with the drawings, the complete construction, the manner of operation and vated position and in consequence, no devices of the character named need be tripped or otherwise manually adjusted before the car may be pushed or backed off the jack.

In our form of jack, as-shown and clescribed, it is only necessary to move the car back until the rollers 13 and 14: come into contact with the inclines -20-21, after which the cartgravitates back until "the wheels engage the floor and the car positioned for being motor driven forwardly or backwardly, as desired, without any shifting or rigid structure, wedge blocks secured be-' neath the longitudinal beams at the respective ends thereof, one of said bearing rollers adapted to lie in cooperative" relation with the wedge blocks at one end of the frame and the other bearing roller adapted to lie in cooperative relation to the wedge blocks at the other end of the frame, a cross bar secured beneath the front end of the frame adjacent to the incline of the'front wedge blocks to form a stop for engagement with the. front bearing roller, and angle plates secured at the rear ends of the front wedge blocks also forming stops for engagement with the front bearing roller, and abutments on the upper side of the frame adapted to be engaged by the front axle of the vehicle to project the frame forwardly and cause said wedge blocks to be rolled up onto the bearing rollers andthereby elevate the frame.

FREDERICK e. IPREIFERT; FERDINAND S'OHULZ.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner -of Patents,

Washington, D. G. 

